摘要
四川广安地区上三叠统须家河组四段砂岩储层是四川盆地内主要的天然气储层之一,其储集岩主要为细-中粒岩屑砂岩、岩屑长石砂岩及石英砂岩,该砂岩储层具有低孔隙度、低渗透率的特点。在对该区上三叠统须家河组气藏宏观沉积特征研究的基础上,采用岩石薄片、铸体薄片、扫描电镜及X射线衍射等方法,对该气藏储层的成岩作用、孔隙演化及其对储集物性的影响进行了探讨,认为研究区砂岩经历了压实压溶作用、胶结作用、交代作用、溶解作用以及破裂等多重成岩作用,已达到了中成岩阶段B亚期。成岩作用是控制该区储层物性的一个关键因素,在孔隙演化过程中,压实压溶、胶结作用主要起破坏性作用;而溶蚀作用、环边绿泥石胶结主要起建设性作用。
Sandstone reservoir in the 4th Member of Xujiahe Formation in Upper Triassic of Guang＇an area in Sichuan is one of the main gas reservoirs in Sichuan Province.Its reservoir rocks are fine to medium-grained lithic sandstone、feldspathic sandstone and quartz sandstone with typical low porosity and permeability.Based on the study of macroscopic depositional characteristics of the gas reservoirs in Upper Triassic Xujiahe Formation in this area,the methods with rock slides,casting thin section,scanning electron microscope and X ray diffraction,are used to study the diagenesis,pore evolution of gas reservoirs and the influences on storage capacity,which indicates that the sandstone in the studied area went through the diagnesis stages of compaction and pressure solution,cementation,metasomatism,dissolution and fracturing,and then reached the B substage of middle diagenetic stage.Diagenesis is a key factor in controlling the physical property of reservoir in this area.During the process of pore evolution,the compaction and pressure solution and cementation played destructive function,while the dissolution and rim chlorite cementation played constructive function.
出处
《世界地质》
CAS
CSCD
2010年第1期96-103,共8页
World Geology
基金
教育部"新世纪优秀人才支持计划"(NECT-04-0911)
四川省重点建设学科建设项目(SZD0414)联合资助
关键词
储层
成岩作用
孔隙演化
须家河组四段
四川广安
reservoir
diagenesis
pore evolution
the 4th Member of Xujiahe Formation
Guang＇an of Sichuan
